A reference framework consisting of a set of points, lines, and/or surfaces, and a set of rules, used to define the positions of points in space in either two or three dimensions.

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3answers
186 views

how to add grid coordinates in QGIS 2.12.0-Lyon in the print composer canvas?

The attached image is the municipal basmap created using QGIS. I was not able to add the grid coordinates in the print composer canvas. How do I add those coordinates?
0
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0answers
24 views

Can I use the bounding coordinates of a coordinate system to determine the coordinate system for undefined coordinate values?

I have a table with coordinates that are undefined, but I know they could be in several different state plane zones/datums. I am thinking I can possibly use coordinate ranges to assign the coordinate ...
0
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1answer
34 views

Using different CRS for map and data?

I followed the tutorial from http://schoolofdata.org/2013/04/27/creating-a-map-using-qgis The France map is from NaturalEarthData and tour de france data is from another source. They used different ...
3
votes
1answer
133 views

Difference between datum and ellipsoid for geodetic coordinates?

Looking at the Wikipedia page for the North American Datum, it seems to imply that the datum is completely defined by the ellipsoid, which defines the major/semi-major axes, flattening, etc. For ...
0
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0answers
51 views

GPS coordinates of a point between two known points

I am looking for an algorithm for finding GPS coordinate of a point on a straight line defined by say points p1 and p2 at distance r from p1. GPS coordinate of p1 and p2 are known. I searched a lot on ...
3
votes
1answer
52 views

How to find Coordinate System of datasets inside MDB and GDB

I have been given some ESRI personal geodatabase files (MDB) and file geodatabase files (GDB). I don't know the coordinate system(s) for these files. Is there a way to do this without using ESRI ...
3
votes
1answer
151 views

Converting coordinates in Florida, USA?

I have an point location and the information given is: Easting: 519122.06 Northing: 1290630.07 Original thought was it's UTM, but does not appear to be correct because I know the point needs to be ...
1
vote
0answers
95 views

Correctly Setting Spatial Reference for Geometry Objects when Geoprocessing

I'm attempting to find the nearest distance between a set of points, and a set of polygons. I don't want to use near tables because I have to do this operation for a large number of different ...
3
votes
1answer
48 views

using a linear solver to get a “centre of gravity” of a set of points

As a programmer, if I have a linear solver available. How can I formulate the following problem as a set of constrains / decisions / goals for the linear solver? I have a matrix of say 10*10, so 100 ...
3
votes
2answers
123 views

Reading Lambert Conformal Conic NetCDF into GeoServer?

I'm working on reading in a NetCDF file into GeoServer and GeoServer has no problem reading it in as a data store, but when I go to publish the layer from the data store I get an error that states ...
0
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2answers
76 views

Latitude / Longitude Polygon from New Zealand Geodatabase or Shapefile?

I have access to ESRI Geodatabase and Shapefile: http://www.stats.govt.nz/browse_for_stats/Maps_and_geography/Geographic-areas/digital-boundary-files.aspx. What I need is to somehow get the polygons ...
1
vote
1answer
56 views

Define Projections for layers with multiple locations in MXD's

# Script to use Layers in MXD source file paths to locate and redefine projections import arcpy, glob, os, sys, arcgisscripting mxd = arcpy.mapping.MapDocument("N:\MXDs\_ThomaKL\MXD GPS ...
2
votes
1answer
56 views

Calculating Angle between two GPS Coordinates in QGIS

i'm looking to create an angle attribute inside a layer of points that has a starting coordinate and a finishing coordinate. The angle needs to be 0-360. Is there a field calculator command that I ...
1
vote
2answers
39 views

Trying to maintain spatial reference on newly created numpy array

I am trying to copy the values from raster into newly created array and then trying to save the array with same spatial reference as raster file inRas = arcpy.GetParameterAsText(0) double_layer = ...
0
votes
0answers
37 views

Is the GCJ-02 coordinate reference system available in QGIS?

I am trying to calculate distances between points in a Chinese province. The measure tool and distance matrix both provide the distance in terms of degrees. I read earlier that I need to change the ...
1
vote
2answers
69 views

Redefining point shapefiles in MXD that have no projection and are located in different folders using ArcPy?

# Script to use Layers in MXD source file paths to locate and redefine projections import arcpy, glob, os, sys, arcgisscripting from arcpy import env, mapping path = os.getcwd() env.workspace = ...
1
vote
1answer
50 views

How to change the extent of a raster after converting its coordinates?

I changed the coordinate system from Conical coordinates to lat/long UTM-39N. It's OK, but the new layer doesn't have appropriate extent, so it can't be plot on other layers. I exported the raster ...
3
votes
2answers
55 views

Alaska Series E projection in ArcGIS for Desktop?

I am trying to digitize a scanned map that appears to be in the Alaska Series E projection. I have also seen this referred to as Modified Transverse Mercator. While this projection is listed as ...
1
vote
1answer
30 views

Would it make sense to translate a city to latitude=0 longitude=0 before doing any calculations?

I'm working on a conversion system for Unity. We want to import some geo-referenced data (not models) losing the least floating point resolution possible. I am currently working on the idea of moving ...
0
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0answers
82 views

Calculate Tiles X,Y, Z for current view or extent in OpenLayers

Im using OpenLayers with the openstreetmap tile server. var urlTemplate = "http://c.tile.openstreetmap.org/{z}/{x}/{y}.png" I would like to download tiles for the current view or an extent. So ...
0
votes
1answer
53 views

Changing coordinate system of layer?

I am using ArcGIS 10.1 and I would like to change the coordinate system of a layer that is already attached to a drawing so that it matches the other layers.
0
votes
1answer
61 views

Using Near (proximity) tool in ArcGIS for Desktop?

I've tried changing GCS and PCS multiple ways but can't seem to figure out how to get the Near (from Proximity tools) to output the Near_DIST in feet. All it outputs is what looks like decimal ...
1
vote
1answer
34 views

Correct long / lat referencing typo in vector layer

This layer is completely misallinged in terms of the standard WGS84 referencing system. I played around a lot with affine transformations and the like. But I presume it is just a typo in the ...
1
vote
0answers
36 views

Coordinate System choice for Nearest Neighbor

Here's an interesting scenario I came upon yesterday and I wanted to throw it out as a question to try help me visualize what is happening. I have a single point (a person, say) who is looking for ...
3
votes
0answers
82 views

Creating custom CRS based on local project parameters in QGIS?

I'm having trouble creating custom proj4 CRS files to work with existing .shp files on local project coordinates. (Local in that the coordinates are relative only to themselves and not the 'real ...
3
votes
1answer
77 views

Changing Dataframe Projection of .MXD to UTM Zone matching each polygon in ArcPy cursor?

I have a polygon shapefile. I used ArcPy scripts to: add a new field to the shapefile use Calculate UTM Zones on each polygon. It spits out UTM projection information into the field I've added. ...
3
votes
2answers
82 views

What kind of projection is this?

Can someone tell me what the projection is in this zone map from NOAA? I am trying to replicate it (or get close) in QGIS.
0
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1answer
61 views

Georeferencing PNG in ArcMap based off of data frame corners?

First, in Arcmap I set the data frame exactly equal to the page layout (2'hx3'w) and exported my hillshade, DEM, etc one after the other from layout view so that they were all the exact same size and ...
1
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0answers
57 views

Calculating areas in metric units on polygons that are stored in geographic coordinate reference system using ArcPy?

If one uses arcpy to calculate areas for a field in metric units on a polygon shapefile in a geographic coordinate system it will work, and give you plausible results. According to the documentation ...
3
votes
1answer
43 views

Assigning spatial info for NetCDF files using ArcGIS for Desktop?

I have quite a few NetCDF files that arrive from a air quality model without any spatial reference. However, I do have the spatial reference information that is required. Within Arc I use "make a ...
1
vote
1answer
36 views

Plot coordinates in ArcGIS 9.3 don't make sense

I have a layer of plot features in ArcGIS 9.3 that I want the UTM coordinates for. So I used the Feature to Point tool and then added XY coordinates to each point. I then viewed the Attribute table ...
2
votes
0answers
62 views

Changing projection on each page of data driven pages

I am working with data driven pages and a raster image of the world. I have a separate polygon shapefile of all of the UTM zones (with a polygon for zones 1-60, north and south, for a total of 120 ...
0
votes
1answer
70 views

Defining Projection Lambert Conformal Conical w custom GCS

I have a shape file from Mexico´s INEGI site that doesn´t have prj file. I am having trouble defining the projection in Arc. INEGI tells me it is projected as Lambert Conformal Conical with a ITRF92 ...
-2
votes
1answer
73 views

Lat/Long converter to local coordinate

I know that is asked quite often but I'm still doing it again :) I have a formula which I am not quite sure of the accuracy, Northing : (Latitude - Base_Latitude) * ( 6378137 * pi/180 ) Easting : ...
2
votes
0answers
63 views

Can 2 GIS layers which representing the same area be compared directly while having the same datum but different coordinate system?

My question is about how coordinate systems affect comparison of different layers - I have tried to refresh my memory about coordinate systems in GIS, but am still unsure about this situation. I am ...
1
vote
1answer
70 views

QGIS does not recognize Arc-created shapefile CRS

I create a new point shapefile in QGIS (2.12) with EPSG:2927. When I view the Layer's Properties, the CRS is correctly listed as EPSG:2927. Happy! I then create a second point shapefile in Arc ...
1
vote
1answer
51 views

Extract by Mask rasters don't line up with original features in ArcGis 9.3

I have 3 features I'm trying to use to extract by mask a DEM raster layer. After I extract by mask the layers visually don't line up. When I try to do further analyses (e.g., extract to point, slope, ...
1
vote
1answer
271 views

Openlayers3 using custom EPSG:25832

I want to use EPSG:25832 as the default projection for all my layers. The projection is not working correctly because the Position (center point) should be in Germany but I end up in France. When I ...
4
votes
2answers
163 views

Merging rasters in QGIS?

I have 3 modis tiles that I want to merge together. They were all reprojected in the same CRS (from sinusoidal to WGS84 UTM zone 32 N), but I cannot succeed. I have tried with merge and virtual ...
0
votes
0answers
93 views

Calculating distances with lat/long in decimals and WGS 84

I need to calculate the distance between points of two different datasets, once with locations of towns, the other with locations of dams. Both are located in different countries in Africa. The more ...
3
votes
2answers
196 views

Ukrainian topographic map: projection and coordinates?

I need some help. I managed to get Ukrainian topographic maps for my project. I'd like to do the georeferencing in QGIS. The problem is that I don't have a clue what projection was used and how to ...
4
votes
0answers
57 views

How to interpolate within defined boundaries of a deformed mesh using R?

My goal is to create an interpolation map of some output model results that are mapped on a deformed mesh (from a numerical simulation). The model results are in an x-y plane (representing ...
1
vote
0answers
97 views

Changing CRS units from meters to kilometers in QGIS

I have shape files with CRS of SWEREF99 with +proj=utm +zone=33 +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs The units are all in meters but I prefer to make a map with coordinates in ...
3
votes
0answers
51 views

Do locations “move” when shifting datum?

I hope that this is the right Stack Exchange for this question. I may be oversimplifying this, but I'm looking for verification in my understanding of the following: If I have a spatial dataset in 2 ...
0
votes
0answers
28 views

Coordinate system for South and North America together?

I am working on project where i need south and north america together and i search for the best coordinate system. I have choosen wgs 1984 but distortion in north part is very big.
0
votes
1answer
33 views

Converting entire map to UTM 18 if only interested in part that is in UTM 18?

I am using some polygons and rasters whose initial extents cover all of Canada or all of North America. I am interested in a small area in Ontario that is in UTM zone 18. I would like to use the UTM ...
1
vote
1answer
34 views

CRS problems with SwtMapPane

I'm quite new to geotools and I'm trying to get to grips with it. Trying to load some shapefiles (see attachment) into a MapContent which in turn is associated with a SwtMapPane I always get an ...
0
votes
1answer
25 views

Layers not overlapping in QGIS? [duplicate]

I downloaded a bunch of wpts from my gps. I converted them to .SHP format with a CRS WGS 84 in QGIS, and started a new project. I then exported some satelite imagery from the internet as a tiff and ...
1
vote
1answer
101 views

Convert SQL Server spatial table with unknown coordinate reference system to GeoJSON with ogr2ogr

I have a table in SQL Server with an STSrid of 0. I would like to convert this table to GeoJSON using ogr2ogr. The problem is, despite converting to EPSG:4326, the resulting coordinates are not valid ...
1
vote
2answers
77 views

QGIS, indoor map with relative coordinates

i am trying to create an indoor map with relative coordinates where the bottom left hand corner of the map is (0, 0), and the CRS is UTM, so the distance between coordinates is in meters. previously ...